.px2rem(@name, @px) {
    @{name}: @px / 75 * 1rem;
}
.txh{
	display: flex;
}
#box{
    width: 100%;
	height: 100%;
    background: #f0ebf0;
	header{
       .px2rem(height,98);
        .px2rem(line-height,98);
        background:#ff5d39;
       ul{
       .txh;
        justify-content:space-between;
       }
	}
}